With the photovoltaic power station, especially the rooftop distributed photovoltaic power generation has been widely popularized. While photovoltaic power generation benefits the people, there are often reports of fire accidents or even accidental personal injury and major property losses due to photovoltaic power plants. Today, let's discuss the fire safety issues that should be paid attention to during the operation and maintenance of photovoltaic power plants.
The DC side of photovoltaic power generation has high voltage and large current. There are many string connectors, and the installation environment is complicated. Many connectors are exposed to sunlight or exposed to wind and rain, which are prone to poor contact and even fire, burning and other fire hazards. Electrical fires are very dangerous, and once they happen, the losses will be heavy. Therefore, the principle of "prevention first" must be implemented to prevent electrical fires before they occur.
Fotovoltaik elektr stantsiyalari, asosan, kontaktlarning zanglashiga olib keladigan yong'inlarning oldini oladi, jumladan:
· The DC side connector sparks the arc and causes a fire;
· Fire caused by equipment failure (combiner box, inverter, distribution box, transformer, high and low voltage switchgear, etc.);
· Lightning strikes cause fire, etc.
Agar fotovoltaik elektr stantsiyasining elektr inshootlarida yong'in aniqlansa, inverterni zudlik bilan o'chirib qo'yish kerak, o'zgaruvchan tok manbaini uzib qo'yish kerak, so'ngra fotovoltaik simni to'liq kesish uchun imkon qadar tezroq uzib qo'yish kerak. o't o'chirish xodimlarining xavfsizligini ta'minlash va keyingi bosqichda yong'inni nazorat qilish uchun fotovoltaik simning boshq manbaidan. .
Og'ir vaziyatda yong'inni o'chirish tashabbusini qo'lga kiritish va yong'inni nazorat qilish uchun vaqtni qo'lga kiritish uchun siz shaxsiy xavfsizlikni ta'minlash sharti bilan yong'inni elektr energiyasi bilan o'chirib qo'yishingiz, so'ngra tegishli joylarda elektr ta'minotini uzishingiz mumkin. vaqt, lekin siz xavfsizlikka e'tibor berishingiz kerak.
Fotovoltaik elektr stantsiyasida yong'in sodir bo'lgan taqdirda, o't o'chiruvchilarni imkon qadar tezroq xabardor qilish va tomdagi fotovoltaik uskunalar elektrlashtirilganligini, o't o'chiruvchilar izolyatsion poyabzal kiyishlari kerak. Yong'inni o'chirish vaqtida elektr toki urishining oldini olish uchun tanaga yoki qo'lingizdagi o't o'chirgichga kuchlanishli simlar yoki elektr jihozlari bilan tegmang.
Fotovoltaik elektr stansiyalari yetarlicha yong‘inga qarshi uskunalar bilan jihozlangan bo‘lishi kerak{0}}, jumladan, quruq kukunli o‘t o‘chirgichlar, karbonat angidrid, 1211, uglerod tetrakloridli yong‘in o‘chirgichlar yoki quruq qum. Elektr yong'inlari uchun suv va ko'pikli o't o'chirish moslamalari qat'iyan man etiladi.
Inverterlar, kontrollerlar va boshqa nozik asboblar sxemalari yoki qavslarni kuzatuvchi motorlar kabi elektr jihozlari uchun odatda yong'inni o'chirish uchun quruq kukun, qum va boshqalarni ishlatish mos emas. Yong'inni o'chirish uchun karbonat angidrid, 1211 va karbonli tetrakloridli yong'inga qarshi vositalardan foydalanish kerak. Chiqindilarning uskunaga tushishiga yo'l qo'ymaslik uchun katta yo'qotishlarga olib keladi.
Shu bilan birga, yong'inni o'chirish uchun asbob-uskunalardan foydalanganda ma'lum masofani saqlash kerak:
(1) 10 kV va undan past kuchlanishli korpus uchun nozul va zaryadlangan tana orasidagi minimal masofa 0,4 m dan kam bo'lmasligi kerak, kuchlanishlilar uchun esa 35 kV va undan yuqori, u 0,6 m dan kam bo'lmasligi kerak;
(2) Fotovoltaik elektr stansiyasining yuqori kuchlanishli elektr qurilmalari yoki liniyasida tuproqli nosozlik yuz berganda, bino ichidagi qutqaruv xodimlari nosozlik joyidan 4 m masofaga kirmasligi kerak; tashqi qutqaruv xodimlari nosozlik joyidan 8 m masofaga yaqinlashmasligi kerak. Yuqoridagi diapazonga kirganda, ular izolyatsion poyabzal kiyishlari kerak (10KV dan yuqori kuchlanish darajasiga chidamli), uskunaning qobig'i va ramkasiga tegganda izolyatsion qo'lqop kiyishlari kerak.